Compound for printers&#39; inking-rolls and the like.



UNITED STATES ATENT orrron.

GRAY STAUNTON, 0F EVANSTON, ILLINOIS, ASSIGNOR T0 WILLIAM S. POTWIN, OF CHICAGO, ILLINOIS.

COMPOUND FOR PRINTERS INKING-ROLLS AND THE LIKE.

No Drawing.

To all whom it may concern:

Be it known that I, GRAY STAUN'roN, a citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, have invented certain, new and useful Improvements in Compounds for Printers Inking-Rolls and the Like, of which the following is a specification.

My invention consists in a compound for printers inking rolls and the like, and it has among its salient objects to provide a cheap composition exhibiting many of the characteristics of rubber, combined with qualities not existing in rubber, and peculiarly fitting the substance for employment in inking rolls.

The commercial requirements of printers inking rolls begin with the essential demand that the roll have good sucti0n, that is to say, the uniform affinity for ink and clinging character of surface that qualifies it for even and ready reception, distribution, and delivery of the ink in the performance of its basic functions in the press.

The printers inking rolls, now commercially in' use, are of a gelatinous nature, subserving this primary requirement but entailing many disadvantagesby reason of their composition and physical attributes. They are comparatively expensive; are short lived in use, have so little resiliency and tensile strength that they are easily damaged in handling, and are cut and destroyed by rules in the form; and arevery sensitive to temperature changes. On this last score, it is a common knowledge that rolls of different composition have to be used in summer and winter and that a sudden change of temperature, such as is apt to occur in fall or spring of some climates, will so seriously affect the rolls in use that complete replenishment ,is necessary to permit of the effective working of the presses, with attendant expense, delay, and annoyance. These disadvantages a substance with the durability, tenacity, resiliency, flexibility, and stability of rubber would overcome in a great degree, but ordinary rubber is not available for use in printing rolls, as it has not the primarily-requisite suction,

Specification of Letters Patent.

Patented Aug. 15, 1911.

Application filed December 6, 1909. Serial No. 531,618.

cannot withstand the ink solvents used in cleaning, and has other inherent disadvantages which prevent its successful employment on any large scale, where ordinarily good work is demanded.

My invention provides a compound, exhibiting the proper quality of suction and resistance to ink solvents, togther with the advantages of rubber-like resiliency, durability, and relative insensibility to tempera.- ture changes, and with the capability for cheap and easy manufacture.

My improved composition involves a base of artificial compound which I term katchook, a filler of pre-vulcanized soft rubber of fairly good grade, and a vulcanizing agent, the whole vulcanized into a suitable consistency. The base compound I will now describe, but I do not claim per se in this application. It consists of a crude gum of the copal group (as pontianak, otherwise termed gutta gelatong) a non-drying vegetable oil (as cotton-seed oil, or rapeseed oil), and a vulcanizing agent (as sulfur), with preferably a small quantity of lime added thereto. A good formula is 9 parts pontianak, and tparts cotton-seed oil, combined under from 350 F. to 400 F. heat in an open vessel with 2 parts of slaked lime and 2 parts of sulfur mixed and added to the mass and the whole vulcanized to about the consistency of the crude rubber of commerce.

In compounding a printers inking roll, I mix on a rubber mill, in suitable proportion, katchook and rubber stock, the lata little lime or litharge, and a little wool grease, and complete the mixing in the mill. The resultant mass is a somewhat sticky, putty-like body, which I flatten out in sheet form, and roll up on the roll-spindle or shaft, or otherwise form it into the desired shape, and insert it in a suitable mold.

- theories hereinafter expressed, for the While in the mold the compound is heated for, say, an hour at about 250 F., or other- Wise treated, to vulcanize it to about the desired stiffness, sayabout that of ordinary printers-roll compound.

It Will, of course, be understood by those skilled in the art thatvariations might be made in the ingredients and proportions, and in the treatment, to vary the precise character and stifiness of the final roduct Without-departure from the-spirit o theinvention, and it Will further be understood that the details above recited are herein embodied for purposes of full disclosure of one operative practice of my invention and 'not with limitational intent. The ka-tchook compound is in a general Way susceptible of treatment very much as would be crude rubber, and the skill ofthe rubber art Will suggest such equivalent changes-"as the appropriateruse-of hyposulfate of lead in lieu of sulfur, litharge instead of lime, etc. Further, While I do not limit myself to the urpose of full disclosure I state my belief that the base compound "of copal gum and vegetable oil, vulcanized, gives to the ultimate composition a peculiarly effective suction,

and other desirable qualities; that'the vulcanized soft rubber stock, being not amenable to further vulcanization, acts both as a filler and as a means of tempering the hardness ofthe Whole mass; that lime is advantageous in the composition both as an oxidizing agent and asa drier; and-that Wool grease aids mechanically in the preparation of the uncured stock and tends to resist ef-' fect of printers ink solvent.

After curing under heat, as described,- the roll is simply removed from its mold, and ifmechanically true'and perfect it is ready for use, as soon as cool. It has the general appearance of rubber, but a typically adhesive feel, or grip, kindred tothat of the common printers-roll composition.= It Will be obvious that the composition is available for many uses, and that slight changes in the compounding and treatment Will vary its hardness. F

' Having thus described my invention, What I claim is: v

' 1. As an article of manufacture," a printers inking roll, characterized by good suction and-rubber-like resiliency and durability; compounded of 'a vulcanized base composition of gum of the copal group, and vegetable oil; admixed With pre-vulcanized rubber and Wool grease; and thereafter-vulcanized.

2. A composition of mattercomprising a base compound formed of-pontianak= and vegetable oil united under heat and vulcanifzed; pre-vulcanized rubber; Wool grease and a vulcanizingagent; vulcanized.

i 3. A composition of-matter comprising a base compound formed of'pontianak, a vegetable oil, an oXidi-z'ingagent, and a vulcanizing agent, united under heat and vulcanized vulcanized rubber; Wool-grease and a vulcanizing agent; Vulcanized. 4:..-A'cOmpQS1 t10-n of-matter comprising a base compound formed of pontianak' and vegetable oil united under heat and vulcanized pre-vulcanized rubber; a vulcaniz- IV. LINN ALLEN, MARY F. ALLEN.

Copies of this patent, may be obtained fur -five cents each, by addressing the Commissioner of Patents,

Washington; 20.0." 

